These temporary ports will be used to handled web requests or send web reference requests, and after it's done, they will be released back to the operating system for reuse, allowing these ephemeral ports to be recycled and used by other applications or for other requests. Some ports are reserved and used by the system itself, other can't be used by other applications like port 80 for Application Server, or port 3389 for remote desktop, or ports 12000-12004 to OutSystems Services), and there's a set of ports called "ephemeral ports" that will be used by applications as temporary ports. I'm talking about connection ports resources on the TCP/IP stack, because each connection will have a unique port to handle the requests, there's only 65535 ( 2^16) available ports on the system. Įphemeral port exhaustion is a resource starvation problem where a machine is no longer able to use its TCP subsystem because it does not have any available connection slots. Although the causes for such symptoms can vary - there's one scenario that can cause a complete lock of systems handling a very large number of web requests per second without any hint of what's going on: TCP/IP port exhaustion. In environments with a very high number of web requests per second, you might find that the application's performance is lower then what you would expect from that system, or even worse, the applications or web services stop responding completely or generate timeout errors, even though your system's resources (CPU, RAM or Network bandwidth) don't seem to be exhausted at all. JMeter is a wonderful tool to stress test your website and your application architecture.
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